What Is MC Number in Trucking?
Also called: Motor Carrier Number
An MC number (Motor Carrier number) is the identifier FMCSA gives a company's operating authority to haul regulated freight for pay across state lines. You need authority if you haul other people's freight, or arrange it, in interstate commerce. It is different from a USDOT number. FMCSA charges $300 for each kind of authority, and a new application can take 20 to 25 business days.
Last reviewed September 23, 2026 · Facts checked October 15, 2026
Key Points
- An MC number identifies FMCSA operating authority. FMCSA also uses FF numbers for freight forwarders and MX numbers for Mexico-based carriers
- You need operating authority if you haul regulated freight owned by others, or arrange it, for pay in interstate commerce
- A USDOT number is different. It identifies any company that runs a vehicle of 10,001 pounds or more in interstate commerce. An MC number adds permission to haul for hire
- FMCSA charges $300 for each kind of authority, and it does not refund application fees
- FMCSA says a new application can take 20 to 25 business days, or longer if it needs more review. Check the grant date on FMCSA's Licensing and Insurance site
- Carriers that do not need authority include private carriers hauling their own cargo, for-hire carriers hauling only exempt commodities, and carriers working only in a commercial zone
- Brokers and shippers check your MC number, authority status and insurance on file before they book freight
MC number vs. operating authority vs. BOC-3 vs. UCR
| MC Number | Operating Authority | BOC-3 | UCR | |
|---|---|---|---|---|
| What it is | Identifier tied to operating authority | Legal permission to operate for-hire | Process-agent designation | Annual registration/fee |
| Who needs it | For-hire interstate carriers of regulated freight | Same as MC number | Any carrier with operating authority | Most interstate carriers, brokers, forwarders |
| Filing frequency | Issued once with authority | Ongoing — must stay active | One-time, updates if agent changes | Annual renewal |
| Governed by | 49 U.S.C. § 13902 | 49 U.S.C. § 13902 / 49 CFR Part 365 | 49 CFR Part 366 | 49 U.S.C. § 14504a |
What's the difference between an MC number and a USDOT number?
These two numbers get confused all the time. Both come from FMCSA. A USDOT number identifies a company that runs a commercial vehicle in interstate commerce. FMCSA uses it to track safety information from inspections, audits and crashes. You need one if your vehicle weighs 10,001 pounds or more (by gross weight rating) and crosses state lines. An MC number comes from operating authority, which is permission to haul regulated freight for pay. A private carrier hauling only its own company's freight needs a USDOT number but not an MC number.
How does a carrier get an MC number?
You apply to FMCSA for operating authority and pay $300 for each kind of authority you want. For example, a company that wants both carrier and broker authority pays $300 for each. Your insurer files proof of insurance with FMCSA, and a process agent files your BOC-3. FMCSA says a new application can take 20 to 25 business days, or longer if it needs more review. When the authority is granted, FMCSA mails the authority papers, usually within 3 to 4 business days.
How can I check an MC number and its status?
Use FMCSA's Licensing and Insurance website. Enter the MC number or USDOT number, complete the "I'm not a robot" check, and search. Open the HTML result and choose Authority History to see the date the authority was granted. If 10 or more business days pass after the grant date and your papers have not come, FMCSA says to call 800-832-5660. Brokers do the same check before they book a load.
Why do brokers check your MC number before booking?
Reputable brokers verify a carrier's MC number, authority status and insurance on file with FMCSA before they hand over freight. It is part of their own due diligence. A lapse in insurance can lead FMCSA to suspend your authority after notice, and the suspension lasts until you fix the problem (49 U.S.C. §13905). Most brokers will not book you while it is suspended, even if you are otherwise ready to run.
Related Terms
Related Free Tools
Authority Age and History Checker
Enter an MC or USDOT number to see how long the authority has been active, every revocation and reinstatement, and every insurance filing.
New Authority Checklist
A step-by-step guide to getting your MC number and starting your trucking operation.
DOT Audit Readiness Checklist
An interactive compliance checklist to get ready for a DOT compliance review.
Carrier & Broker Lookup
Verify MC/DOT authority, check credit scores, and spot red flags before hauling.
Frequently Asked Questions
What is an MC number in trucking?+
An MC (Motor Carrier) number is the identifier FMCSA gives a company's operating authority to haul regulated freight for pay across state lines. Brokers, shippers and FMCSA use it to see your authority. It is separate from the USDOT number that every interstate commercial carrier needs.
How much does an MC number cost?+
FMCSA charges $300 for each kind of authority, and it does not refund application fees. You also pay for insurance, which your insurer files for you, and a BOC-3 filing from a process agent company. Those prices are set by the companies, not by FMCSA.
How long does it take to get an MC number?+
FMCSA says a new application can take 20 to 25 business days, or longer if it needs more review. Your insurance and BOC-3 must be on file too. Check the grant date on FMCSA's Licensing and Insurance site under Authority History.
What is the difference between an MC number and a USDOT number?+
A USDOT number identifies a company that runs a vehicle of 10,001 pounds or more in interstate commerce. An MC number comes from operating authority, which is permission to haul regulated freight for pay. A for-hire interstate carrier of regulated freight needs both. A private carrier hauling its own goods needs only a USDOT number.
Do you need an MC number to be an owner-operator?+
It depends on how you operate. Leased owner-operators running under a carrier's authority usually don't need their own MC number. They run under the carrier's. An owner-operator who wants to book loads directly with brokers needs their own authority, and so their own MC number.
Who does not need an MC number?+
FMCSA lists carriers that do not need operating authority. They are private carriers that haul their own cargo, for-hire carriers that haul only exempt commodities, and carriers that work only inside a commercial zone. They may still need a USDOT number.
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This is industry terminology and typical practice. It is not legal or tax advice. Rates, fees, and rules mentioned are general ranges. Confirm the details on your rate confirmation, carrier agreement, or a current official source.